If there is a soul, what is it, and where did it come from, and where does it go? Can anyone who is guided by his reason possibly imagine a soul independent of a body, or the place of its residence, or the character of it, or anything concerning it? If man is justified in any belief or disbelief on any subject, he is warranted in the disbelief in a soul. Not one scrap of evidence exists to prove any such impossible thing.

Why I Am an Agnostic and Other Essays (ed. 1995)